U.S. patent application number 10/398245 was filed with the patent office on 2004-04-01 for antimicrobial polyalphaolefin composition.
Invention is credited to Kaarnakari, Matti.
Application Number | 20040063806 10/398245 |
Document ID | / |
Family ID | 8559277 |
Filed Date | 2004-04-01 |
United States Patent
Application |
20040063806 |
Kind Code |
A1 |
Kaarnakari, Matti |
April 1, 2004 |
Antimicrobial polyalphaolefin composition
Abstract
The present invention relates to an antimicrobial
polyalphaolefin composition comprising polyalphaolefin and
triclosan and/or paraben as antimicrobial compound(s). The
composition may be used either as such in various applications, or
as a starting material for producing products that should have
antimicrobial properties.
Inventors: |
Kaarnakari, Matti; (Luoma,
FI) |
Correspondence
Address: |
YOUNG & THOMPSON
745 SOUTH 23RD STREET 2ND FLOOR
ARLINGTON
VA
22202
|
Family ID: |
8559277 |
Appl. No.: |
10/398245 |
Filed: |
October 6, 2003 |
PCT Filed: |
October 12, 2001 |
PCT NO: |
PCT/FI01/00887 |
Current U.S.
Class: |
523/122 |
Current CPC
Class: |
C08L 97/02 20130101;
B27K 3/50 20130101; C08L 53/02 20130101; B27K 3/15 20130101; C08L
97/02 20130101; C08L 97/02 20130101; C08L 21/00 20130101; C08L
23/16 20130101; A61Q 17/005 20130101; C08L 97/02 20130101; A01N
37/40 20130101; A61Q 19/00 20130101; C14C 9/00 20130101; A23L
3/3463 20130101; C08L 21/00 20130101; C08L 23/16 20130101; A01N
25/10 20130101; C08L 23/10 20130101; C08L 2666/04 20130101; C08L
91/00 20130101; C08L 2666/06 20130101; C08L 53/02 20130101; C08L
21/00 20130101; C08L 2666/04 20130101; A01N 2300/00 20130101; C08L
2666/04 20130101; A01N 31/16 20130101; C08L 53/00 20130101; A61K
8/90 20130101; C08L 23/02 20130101; A01N 37/40 20130101; A61K 8/37
20130101; C08L 23/16 20130101; C08L 97/02 20130101; A61Q 11/00
20130101; C08L 97/02 20130101; C08L 23/02 20130101; C08L 23/10
20130101; A01N 37/40 20130101; A61K 8/347 20130101; A61K 8/8111
20130101; C08L 53/00 20130101; C08L 97/02 20130101; C08L 97/02
20130101; C08L 53/02 20130101; C08L 91/00 20130101; C08L 53/00
20130101 |
Class at
Publication: |
523/122 |
International
Class: |
C08K 003/00 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 12, 2000 |
FI |
20002245 |
Claims
1. Antimicrobial polyalphaolefin composition, characterized in that
said composition comprises polyalphaolefin and 0.01 to 30% by
weight of 2,4,4'-trichloro-2'-hydroxyphenyl ether, and/or 0.01% by
weight of paraben as antimicrobial compounds.
2. Antimicrobial polyalphaolefin composition of claim 1,
characterized in that said polyalphaolefin is a hydrogenated
polydecene.
3. Antimicrobial polyalphaolefin composition of claim 1 or 2,
characterized in that said composition comprises vitamin A and/or
E.
4. Use of an antimicrobial polyalphaolefin composition of claim 1
or 2 as a protecting and lubricating oil in food, technochemical,
and pharmaceutical industries.
5. Use of an antimicrobial polyalphaolefin composition of claims 1
to 3 in cosmetics industry, and the use thereof as a skin care oil,
or on the skin in connection with the use of prostheses.
6. Use of an antimicrobial polyalphaolefin composition of claim 1
or 2 for impregnation of wooden products and wood, and for the
treatment and polishing of leather.
7. Use of an antimicrobial polyalphaolefin composition of claim 1
or 2 as a plastisizer in rubber mixtures, thermoplastic elastomers,
thermoplastic vulcanizates, and silicones to improve the
antimicrobial properties thereof.
8. Process for producing rubber mixtures, thermoplastic elastomers,
thermoplastic vulcanizates, and silicones, characterized in that an
antimicrobial polyalphaolefin composition of claim 1 or 2 is used
as the plastisizer in said production.
9. Process of claim 8, characterized in that said antimicrobial
polyalphaolefin composition is added to said rubber mixtures,
thermoplastic elastomers, thermoplastic vulcanizates, and
silicones, optionally heated to a temperature between 10 and
90.degree. C., to the final concentration of 0.1 to 1.0% by weight
of 2,4,4'-trichloro-2'-hydro- xyphenyl ether, and/or paraben in
plastic product.
10. Process of claim 8 or 9, characterized in that said
thermoplastic elastomer is a PP/EPDM or PP/EPR blend or a styrene
based thermoplastic elastomer, preferably a SEBS blend.
Description
[0001] The present invention relates to an antimicrobial
polyalphaolefin composition comprising polyalphaolefin and an
antimicrobial compound. The composition may be used either as such
in various applications, or as a starting material for producing
products that should have antimicrobial properties.
[0002] Various antimicrobial formulations such as solutions,
compositions for cleaning purposes and like are commonly used to
desinfect surfaces and instruments. In technochemical, cosmetics,
pharmaceutical and food industries as well as in hospitals,
antimicrobial products are used to prevent the growth of microbes
such as bacteria, fungi, moulds, and yeasts. Further, said products
are used to control the health risk, and the deterioration of
products and the development of bad odour therein and the
discolouration thereof due to microbes. In food industry, problems
are caused by the protecting and lubricating oils used in machines
and apparatuses allowing microbial e.g. Listeria bacterial growth
under favourable conditions. Droplets of such contaminated
lubricating oil entering the products form a serious health
hazard.
[0003] Patent NO 180104 discloses a liquid silicone oil containing
antibacterial agents such as triclosan, and the use thereof to fill
dental cavities in connection with dental bridges and
prosthesis.
[0004] Patent publication JP 07021091 presents a microbicidal
polyolefin composition comprising polyolefins containing chlorine
compounds, bactericidal compounds, phosphorus compounds, phenolic
compounds and neutralizing compounds.
[0005] U.S. Pat. No. 5,069,907 discusses cloth materials used in
surgery. This material consists of synthetic polymer film or a
cloth containing 0.01-25% by weight of an antimicrobial agent,
preferably 2,4,4'-trichloro-2'-hydroxyphenyl ether. Alternatively,
the cloth may comprise so-called fastening agent between the skin
and the cloth, mixed with said antimicrobial agent. Suitable
fastening agents are the following: polyvinyl ether, acrylic
binder, polyolefin, silicone binder, polyester, and
polyurethane.
[0006] Patent application WO 99/37710 is directed to polymeric
compounds containing at least one phenolic compound in an amount of
0.01 to 10% by weight, the corresponding master batch, and the
production and use thereof. The polymeric compounds mentioned
include polyolefins selected in this case from: polyethylene and
the derivatives thereof, LDPE, HDPE, LLDPE, EVA, EBA, EEA, EAS,
EVK, ETFE, PEC, CSM, VPE, EPB, EPDM, ERM, polybutylene, and
polyisobutylene. Phenolic compounds preferably mean
2,4,4'-trichloro-2'-hydroxyphenyl ether. Such end uses as boxes,
containers and waste containers for storage and transportation are
mentioned
[0007] Patent application FI 971338 discloses coatings of
structures and profiled articles containing a mixture of
thermoplastic elastomer with a non-elastomeric polyolefin, in
general with homopolymers or random copolymers of propylene. An
oligomer of poly-.alpha.-olefine type is used as the polyolefin
plastisizer in a matrix plastic (EPR, EBR, EPBR, PBR, SBR, EPM,
EPDM). The monomers used comprise at least 3 carbon atoms,
preferably 6 to 12 carbon atoms. For example, reference is made to
U.S. Pat. No. 4,032,591 and EP Patent 31S186 wherein 1-decene is
mentioned.
[0008] Patent application WO 99/27792 discloses a concentrate
containing biocides comprising zinc pyridine and another biocide,
preferably a halogenated phenol, preferably 25 to 45% by weight of
2,4,4'-trichloro-2'-hydroxyphenyl ether. Cleaning devices and
plastic materials are mentioned as end uses. In addition, the
production thereof is disclosed. The biocidal compound is dissolved
in a plastisizer to be added to the polymer being produced.
Suitable plastisizers are polybutylene, LDPE, LDPP, and paraffin
wax.
[0009] Polyalphaolefins are liquid oils, the starting materials of
which are monomers having most suitably 8 to 12 carbon atoms. The
most common starting material is the decene (C.sub.10).
[0010] The term polyolefin refers to all such thermoplastics
wherein the carbon skeleton of the polymer is formed by
polymerizing monomers having carbon-carbon double bonds. In this
polymerization, these double bonds are opened to form carbon-carbon
bonds between the monomers. These polyolefins include for instance
polyethylene, polypropylene, EPR, SBR, EBA, EMA, and EVA.
[0011] The object of the present invention is to provide an
antimicrobial polyalphaolefin composition comprising
polyalphaolefin and antimicrobial compound/compounds, and the use
of this antimicrobial polyalphaolefin composition for various
applications.
[0012] The characteristic features of the antimicrobial
polyalphaolefin compositions of the present invention, and the uses
thereof are disclosed in the appended claims.
[0013] It is found that colourless, odourless, tasteless and clear
antimicrobial polyalphaolefin compositions may be produced from
polyalphaolefins, preferably from polydecenes, and more preferably
from food grade hydrogenated polydecenes by adding to this
polydecene 0.01 to 30% by weight of
2,4,4'-trichloro-2'-hydroxydiphenyl ether (triclosan), or 0.01 to
5% by weight of n-propyl ester of hydroxybenzoic acid, or n-methyl
ester of hydroxybenzoic acid (paraben) or mixtures thereof,
optionally by using heat.
[0014] Particularly preferable polydecenes are food grade
polydecenes NEXBASE.TM. 2004FG, NEXBASE.TM. 2006FG, and NEXBASE.TM.
2008FG (Fortum Oil and Gas Oy). 0.01 to 30% by weight of triclosan
and/or 0.01 to 5% by weight of paraben may be dissolved in
polydecene at the temperature of 10 to 90.degree. C. depending on
the concentration desired. Thus, an oily antimicrobial composition
is obtained that is suitable for several applications in foor,
pharmaceutical, technochemical, and cosmetics industry, and in
hospitals. Further, it may also be used as an antimicrobial
plastisizer in the plastics industry.
[0015] The composition of the invention may be used in food
industry as a protecting and lubricating oil for machines to
prevent in the oil the growth of microbes that are unwanted and
hazardous to health, and further, to prevent the passing thereof
from the oil to the products. Said antimicrobial compositions may
also be used as protecting and lubricating oils of apparatuses in
pharmaseutical industry to reduce any contamination risk. The
antibacterial polyalphaolefin composition of the present invention
may be used as such as a skin care oil and as a product to be
applied on the skin in connection with the use of prostheses before
the disposition thereof to prevent the microbial growth under the
prostheses and unpleasant odour, and for other similar applications
in connection with the use of prostheses. The antimicrobial
composition of the invention may also be used to impregnate various
wooden surfaces and wooden products particularly under
circumstances where it is very important to prevent the unwanted
growth of microbes and the deterioration of the wooden surface.
Tooth picks impregnated with the composition of the invention may
be mentioned as an example for such use. Moreover, the composition
of the invention may be used to treat and polish leather.
[0016] The composition is also particularly useful as an
antimicrobial plastisizer to simultaneously improve the
antimicrobial properties of rubber mixtures, thermoplastic
elastomers, thermoplastic vulcanizates and silicones. Plastisizing
agents and oils are used in rubber mixtures (a), thermoplastic
elastomers (b), vulcanizates thereof (c) and silicones (d) to
plastisize the hardness of the product and to provide more flexible
products having a soft surface and a lower residual compression,
the products being suitable for lower working temperatures.
[0017] (a) Normally Plastisized Rubbers (Elastomers):
[0018] EPR=ethylene-propylene rubber
[0019] EPDM=ethylene-propylene-diene rubber
[0020] NR=natural rubber
[0021] IIR=butyl rubber
[0022] ACM/EAM=polyacrylate rubber
[0023] SBR=styrene-butadiene rubber
[0024] 1,2-sPB=1,2-syndiotactic polybutadiene rubber.
[0025] (b) Plastisized Thermoplastic Elastomers; Polypropylene
Commonly as a Crystalline Thermoplastic in a Mixture:
[0026] SBC=styrene-butadiene blockcopolymers,
1 unhydrogenated version hydrogenated version SBS SEBS SB SEB SI
SEP
[0027] EPR=ethylene-propylene rubber
[0028] EPDM=ethylene-propylene-diene rubber
[0029] NR=natural rubber
[0030] IIR=butyl rubber
[0031] ACM/EAM=polyacrylate rubber
[0032] SBR=styrene-butadiene rubber
[0033] 1,2-sPB=1,2-syndiotactic polybutadiene rubber.
[0034] (c) Thermoplastic Vulcanizates:
[0035] Vulcanization is accomplished while mixing either by means
of a sulfur compound, organic peroxide, or with a phenolic resin
according to the type of the elastomer.
[0036] (d) Silicones.
[0037] In many cases, the use of a plastisizer lowers the raw
material costs of the products and improves the processibility
thereof. An advantage attained with the addition of a plastisizer
is the improvement of the collapse resistance of an article made of
thermoplastic elastomer exposed to oil in the environment.
Plastisizers present in the product reduce the ability thereof to
absorb additional hydrocarbons.
[0038] No plastisizers may be used in crystalline plastics since
the crystalline structure will not tolerate the presence of an oil.
Unplastisized plastics typically include polycarbonates,
polyolefins (PE and PP), polyamides and polyurethanes. Compounding
these plastics with elastomers provides in certain cases mixtures
that may be plastisized.
[0039] With respect to performance, polyalphaolefins have several
advantages in plastisizing applications. For instance:
[0040] superior heat resistance is an important feature in medical
apparatus and device applications requiring repeated sterilization
or heating of the article in a microwave oven, for instance as a
component of a food tray. There are also other applications
profiting from the high heat resistance, such as cable applications
and engine room applications in automobile industry.
[0041] strictly limited composition, that is, a narrow molecular
weight distribution allows for the selection of the desired
molecular weight, thus minimizing the evaporation effects of the
plastisizing agent or oil. In addition, the flash point of
polyalphaolefin is generally higher at the desired viscosity than
that of conventional mineral oils, this being favourable for
processing. With respect to its quality, polyalphaolefin is a pure
product, thus often facilitating the approval by the
authorities.
[0042] a low working temperature is an important characteristic of
polyalphaolefins. They crystallize at very low temperatures, thus
making possible to lower the brittle temperature of rubber or a
thermoplastic elastomer. This property is particularly advantageous
for styrene elastomers. In applications of the automobile industry,
the required lowest working temperature is commonly below
40.degree. C.
[0043] Since 2,4,4'-trichloro-2'-hydroxyphenyl ether (triclosan) is
very soluble in polyalphaolefins, a triclosan concentration
necessary for the improvement of the antimicrobial properties of an
elastomer products may be attained in plastisizer application.
Moreover, the antimicrobial spectrum of triclosan is very wide, as
the Table 1 below shows. By combining this wide spectrum
antimicrobial activity with the favourable properties of
polyalphaolefins, a composition particularly suitable for medical
and medicinal apparatus and device applications and for seals of
food packages is obtained.
2TABLE 1 Microbiostatic effect of triclosan (Irgaguard B 1000)
IRGAGUARD Strain B 1000 Gram-positive bacteria Origin No. Medium
[ppm] Comment Actinomyces bovis A NA 1.0 Actinomyces israelii NCTC
8047 NA 1.0 Actinomyces naeslundii A NA 1.0 Bacillus cereus A NA
3.0 Bacillus cereus var. mycoides A NA 3.0 Bacillus megatherium A
NA 3.0 Bacillus subtilis NCTC 8236 NA 0.1 Clostridium botulinum
NCTC 3805 EA 3.0 Clostridium difficile ATCC 9684 BHI-A 5.0
Clostridium perfringens NCTC 3110 EA 10.0 Clostridium sporogenes A
EA 10.0 Clostridium tetani NCTC 9571 EA 3.0 Corynebacterium acnes*
ATCC 6919 BHI-A 3.0 Corynebacterium diphtherias NCTC 3984 BHI-A 3.0
Corynebacterium minutissimum ATCC 23348 BHI-A 3.0 Corynebacterium
xerosis ATCC 373 M-H 5.0 Enterococcus faecalis ATCC 29212 M-H 4.0
Enterococcus faecalis ATCC 6055 M-H 5.0 Enterococcus faecalis NCTC
12201 M-H 5.0 Varicomycin resistant Enterococcus faecalis NCTC
12203 M-H 5.0 Varicomycin resistant Enterococcus faecium ATCC 10541
BHI-A 3.0 Enterococcus faedium NCTC 8619 BHI-A 10.0 Enterococcus
faedium ATCC 6057 M-H 4.0 Enterococcus arabinosus ATCC 8014 MACA
33.0 Lactobacillus delbrueckii ATCC 7830 MACA 33.0 Lactobacillus
fermenti ATCC 707 MACA 33.0 Lactobacillus rhamnosus NCTC 7469 MACA
33.0 Listeria monocytogenes ATCC 15313 BHI-A 1.0 Micrococcus luteus
ATCC 7468 M-H 4.0 Mycobacterium phlei A BHI-A 0.3 Mycobacterium
smegmatis NCTC 8152 BHI-A 1.0 Mycobacterium tuberculosis A YA 100.0
Nocardia asteroides NCTC 6761 BHI-A 3.0 Sarcina lutee NCTC 196
BHI-A 3.0 Sarcina urea ATCC 6473 BHI-A 0.1 Sporosarcina urea ATCC
6473 BHI-A 0.1 Staphylococcus aureus ATCC 29213 M-H <0.125
Staphylococcus aureus NCTC 6571 NA 0.03 Staphylococcus aureus ATCC
9144 M-H 0.05 Staphylococcus aureus NCTC 6966 NA 0.1 Staphylococcus
aureus ATCC 13709 NA 0.01 Staphylococcus aureus ATCC 6538 NA 0.01
Staphylococcus aureus NCTC 11940 M-H 0.01 Methicillin resistant
Staphylococcus aureus NCTC 12232 M-H 0.01 Methicillin resistant
Staphylococcus aureus NCTC 12493 M-H 0.01 Methicillin resistant
Staphylococcus aureus NCTC 12497 M-H 0.01 Methicillin resistant
Staphylococcus aureus NCTC 10443 M-H 0.01 Methicillin resistant
Staphylococcus aureus NCTC 10703 M-H 0.01 Methicillin resistant
Staphylococcus aureus NCTC 11150 M-H 0.02 Methicillin resistant
Staphylococcus albus NCTC 7292 NA 0.1 Staphylococcus epidermidis
ATCC 12228 M-H <0.125 Staphylococcus hominis ATCC 27844 M-H 1.0
Staphylococcus hyicus NCTC 7944 BHI-A 0.03 Staphylococcus lactis
NCTC 8340 NA 3.0 Staphylococcus saprophyticus NCTC 7292 NA 0.1
Streptococcus agalactiae NCTC 8181 BHI-A 3.0 Streptococcus
heamolyticus A A BHI-A 3.0 Streptococcus pneumoniae ATCC 33400 M-H
4.0 Streptococcus pyogenes ATCC 21059 M-H 4.0 Streptococcus
saprophyticus ATCC 15305 M-H 0.125 Streptococcus coelicolor A BHI-A
1.0 IRGAGUARD Strain B 1000 Gram-negative bacteria Origin No.
Medium [ppm] Comment Aerobacter arogenes CITM 413 NA 1.0
Acinetobacter lwoffii ATCC 15309 M-H 0.125 Alcaligenes faecalis A
NA >100 Bacteroides fragilis ATCC 23745 M-H 2.0 Brucella abortus
NCTC 8226 BR.A.A. 0.1 Brucella intermedia A BR.A.A. 0.1 Citrobacter
freundii A NA 3.0 Enterobacter aerogenes ATCC 13048 M-H 0.5
Enterobacter cloacae ATCC 13047 M-H 0.5 Enterobacter sakazakii NCTC
8155 NA 0.3 Escherichia coli NCTC 9663 NA 0.3 Escherichia coli NCTC
11186 M-H 0.5 Tobramicin resistant Escheria coli ATCC 8196 M-H 0.02
Escherichia coli ATCC 9661 NA 0.3 Escherichia coli ATCC 11229 M-H
0.5 Escherichia coli ATCC 25922 M-H 0.25 Escherichia coli ATCC
10536 BHI 0.5 Escherichia coli ATCC 35150 M-H 0.2 Serotype 0157
Escherichia coli ATCC 4388 M-H 0.1 Serotype 0157 Escherichia coli
ATCC 43889 M-H 0.2 Serotype 0157 Escherichia coli ATCC 43890 M-H
0.2 Serotype 0157 Haemophilius influenca ATCC 33391 B-A 2.0
Klebsiella aerogenes NCTC 8172 NA 0.3 Klebsiella edwardsii NCTC
7242 NA 0.3 Klebsiella oxytoca ATCC 43165 M-H 1.0 Klebsiella
pneumoniae ATCC 4352 NA 0.3 Klebsiella pneumoniae ATCC 10031 M-H
0.125 Loefferella mallei NCTC 9674 NA 0.3 Loefferella pseudomallei
NCIB 10230 NA 1.0 Moraxella glucidolytica A NA 0.3 Moraxella
lwolffii A NA 0.1 Neisseria catarrhalis NCTC 3622 BA 33.0
Pasteurella pseudotuberculosis C-G NA 10.0 Pasteurella septica NCTC
948 NA 0.1 Proteus mirabilis ATCC 14153 M-H 0.5 Proteus vulgaris
NCTC 8313 NA 0.1 Proteus vulgaris NCTC 4636 NA 0.3 Pseudomonad
aeruginosa ATCC 12055 NA >1000 Pseudomonas aeruginosa NCTC 8060
NA >1000 Pseudomonas fluorescencens NCTC 4755 NA >100
Salmonella enteritidis A NA 0.1 Salmonella paratyphi A NCTC 5322 NA
0.3 Salmonella paratyphi B NCTC 3176 NA 0.3 Salmonella paratyphi B
NCTC 5704 NA 0.1 Salmonella typhimurium NCTC 5710 NA 0.3 Salmonella
typhi NCTC 8384 NA 0.3 Salmonella typhi NCTC 786 NA 0.3 Serratia
marcescens ATCC 14756 M-H >512 Shigella dysenteriae NCTC 2249 NA
0.1 Shigella flexneri NCTC 8192 NA 0.3 Shigella flexneri NCTC 8204
NA 0.1 Shigella sonnei NCTC 7240 NA 0.1 IRGAGUARD Strain B 1000
Gram-negative bacteria Origin No. Medium {ppm] Comment Vibrio
cholerae A NA 10.0 Vibrio eltor NCTC 8457 NA 10.0 IRGAGUARD Strain
B 1000 Molds and yeast Origin No. Medium [ppm] Comment Aspergillus
fumigatus ATCC 9197 SMA 10 Aspergillus niger ATCC 6275 M 30 Candida
albicans ATCC 10259 M 3 Candida albicans A SMA 10 Candida
paracrusei A SMA 4 Candida parapsylosis A SMA 30 Candida
stellatoidae A SMA 10 Candida tropicalis A SMA 10 Candida
tropicalis DSM 1346 M-H 10 Candida utilis A SMA 33 Epidermophyton
floccosum ATCC 10227 SMA 1-10 Keratinomyces ajelloi A SMA 10
Microsporum canis ATCC 10214 SMA 3 Pityrosporum ovalae ATCC 14521 M
>1000 Trichophyton cutaneum A SMA 10 Trichophyton mentsgrophytes
ATCC 9533 SMA 1 Trichophyton rubrum A SMA 10 Trochophyton tonsurans
A SMA 10 Key Media Origin NA Nutrient Agar CITM official culture
collection BA Blood Agar DSM German Collection of Microorganisms
(Germany) BR.A.A. Brucella Agar Albimi NCTC National Collection of
Type Culture (UK) MACA Micro Assay Culture Agar ATCC American Type
culture collection (USA) BHI-A Brain Heart Infusion Agar C-G Ciba
EA Eugon Agar A Bacteriological or veterinary Institutes YA Youmans
Agar M Mycophil Agar SMA Sabouraud Maltose Agar M-H Muller Hinton
Agar
[0044] Elastomers and plastics used in medical applications and
having a very high compatibility with polyalphaolefins include:
3 Compatibility with Type of plastic Most common plastisizers
polyalphaolefins PP/EPDM Paraffin oil, naphtalene oil Very high
PP/SBC Paraffin oil, naphtalene oil Very high
[0045] Next, the use of antimicrobial polyalphaolefin composition
of the invention as plastisizing agents in plastics is discussed in
more detail.
[0046] 1. Use of an Antimicrobial Polyalphaolefin Composition in
Elastomers: PP/EPDM or PP/EPR Blend
4 Raw material %, by weight EPDM or EPR 5 to 80 Polypropylene 15 to
90 Plastisizer 1 5 to 30 polyalphaolefin Plastisizer 2 0 to 35
mineral oil Antimicrobial compound 0.1 to 30 triclosan Antioxidant
0 to 0.3 Peroxide 0 to 0.1 di-tert-butyl peroxide Internal
lubricant 0 to 0.2 magnesium stearate
[0047] 2. Use of a Antimicrobial Polyalphaolefin Composition in
Styrene Based Thermoplastic Elastomer: SEBS Blend.
5 Raw material % by weight SEBS 30 to 50 CaCO.sub.3 0 to 20
Polypropylene 0 to 30 Plastisizer 1 5 to 30 polyalphaolefin
Plastisizer 2 0 to 35 mineral oil Antimicrobial compound 0.1 to 30
triclosan Antioxidant 0 to 0.3
[0048] The combination PP/SEBS is generally used in those
applications of styrene elastomers that are more demanding with
respect to working temperature and environmental pollution.
[0049] Typical medical uses of elastomers are syringes and needles,
intravenous, urinary catheters, dosage tubings and devices,
clinical cardiac valves and vessel implants, disposable packages
and trays.
[0050] The antimicrobial polyalphaolefin composition of the
invention has several advantages. At lower concentrations of the
antimicrobial agents, preferably at 0.01 to 5%, more preferably 0.1
to 2% by weight, the composition may be used as a skin oil, or on
the skin in connection with prosthesis, and further, to impregnate
leather and wooden surfaces. According to studies, reddening,
abrasion, callousness and infections of the skin are reduced by
more than 80% among carriers of prosthesis. Thus, the spreading and
growth of microbes and the accompanying health risk may be
prevented, and the deterioration of products hindered.
[0051] In food and pharmaceutical industry, contamination of
products by unwanted microbes is both a serious economic risk
factor and a health hazard to the consumers. The risk of microbial
contamination may be reduced and prevented by using the
antimicrobial polyalphaolefin composition of the invention
containing 0.1 to 5%, preferably 0.1 to 2% by weight of the
antimicrobial agent as the protecting and lubricating oil in
apparatuses wherein the oil may find its way into the product
contacting them.
[0052] In skin care applications, moisturizing and repairing
properties of the antimicrobial polyolefin may be improved by
adding vitamin compounds (retinyl palmitate or vitamin A, and
tocopherol acetate or vitamin E) soluble in fat. As in known,
vitamins A and E effectively moisturize of the skin, alleviate
effects due to ageing, and promote the renewal thereof. Vitamin E
is also an antioxidant.
[0053] Antimicrobial polyalphaolefin oil containing vitamins may be
used as plastisizer for instance in silicone materials and
elastomers. It is possible to produce a material exuding oil that
is very comfortable in use. For instance, it may be used to treat
wounds and burns since it will not stick to the skin and has
nourishing properties.
[0054] In plastisizer applications, the antimicrobial
polyalphaolefin composition has important advantaged, including the
possibility to incorporate antimicrobial triclosan into plastic in
an amount of 0.01 to 30% by weight, and/or a desired amount of
paraben dissolved in polydecene. Further, the ratio of polydecene
to antimicrobial agent may be freely adjusted by means of optional
heat during dissolution of the agent, and the amount of polydecene.
The composition optionally having a temperature of 10 to 90.degree.
C. may be mixed to elastomers and plastics during the production
thereof preferably to obtain a content of triclosan of 0.1 to 1.0%
by weight of the plastic product. In this manner, the preparation
of separate "master batches" is avoided, thus lowering the costs
and reducing process steps. Elastomer and plastic products
particularly useful in medical and medicinal apparatus applications
are thus obtained. In such final uses, it is extremely important to
be able to prevent and/or reduce growth of unwanted microbes on
apparatuses and devices, thus considerably lowering the costs due
to infections caused by such unwanted microbes among patients.
Medical applications have several special requirements on materials
such as resistance to sterilization. These requirements are
restricted in no way by the composition of the invention.
[0055] The invention will now be illustrated in more detail with
the following examples without wishing to limit it to these
exemplary solutions.
EXAMPLE 1
[0056] Bacteriostatic Effect of the Antimicrobial Polydecene
Composition
[0057] The antimicrobial composition of the invention comprised
hydrogenated polydecene and 0.3% by weight of triclosan. The
activity of the composition was tested and the composition was
found to have a bacteriostatic effect on Staphylococcus aureus
NCTC4163, Escherichia coli NTCT10538, Klebsiella pneumoniae
ATCC27736, and Proteus vulgaris NTCT4635 strains.
EXAMPLE 2
[0058] Tooth picks were impregnated with an antimicrobial
polydecene composition of the invention containing 0.3% by weight
of triclosan. The picks were then cultivated on a plate with the
bacterium Staphylococcus aureus. It was found that the growth of
the bacteria was effectively inhibited.
[0059] A photo of a cultivation plate of the tooth picks is shown
in FIG. 1.
[0060] Use of Antimicrobial Polyalphaolefin Composition in
Plastisizers
EXAMPLE 3
[0061] Elastomer: EPDM or PP/EPR Blend
6 Raw material % by weight Products EPDM or EPR 59.8/59.5 Vistalon
805/Nordel IP 3745P Polypropylene 29 Escorene PP 4152 Plastisizer 1
10 polydecene Plastisizer 2 0 mineral oil Antimicrobial agent 0.3
triclosan Antioxidant 0.3 Irganox B-225 Peroxide 0.1 di-tert-butyl
peroxide Internal lubricant 0.2 magnesium stearate
[0062] With the composition of the example, good processing
characteristics and a Shore A hardness of 85 are attained. In
addition, the antimicrobial properties of the composition are
comparable to those in preceeding examples. Thermal ageing
properties of the mixture are also especially good.
EXAMPLE 4
[0063] Styrene Based Thermoplastic Elastomer: SEBS Blend
[0064] The example is directed to a basic SEBS blend. The
combination PP/SEBS is generally used in those applications of
styrene elastomers that are demanding with respect to working
temperature and environmental pollution.
7 Raw material % by weight Products: SEBS 30 Shell Kraton G-1651
CaCO.sub.3 15 Omycarb 2A, OMYA Polypropylene 13.4 Escorene PP 4152
Plastisizer 1 35 polydecene Plastisizer 2 0 mineral oil
Antimicrobial compound 0.3 triclosan Antioxidant 0.3 Irganox
B-225
[0065] The ability to plastisize SEBS elastomers greatly depends on
the styrene content thereof. An elastomer with a low styrene
content accepts plastisizer more than 1.5 times its own weight. The
antimicrobial properties of the exemplary mixture are comparable to
those in examples 1 and 2.
EXAMPLE 5
[0066] AATCC method 147-1998 (Antimicrobial Activity of Textile
Materials: Parallel Streak Method) was used as the test method.
Test microbes (Staphylococcus aureus) were cultivated on blood
plates according to sensitivity assay technique. The preparates
were placed in contact with the agar, and the plates were incubated
at 35.degree. C. over night. The bacteriostatic activity was
assayed as the width of the inhibition zone around the sample or as
reduced growth under the sample.
8TABLE 1 Antimicrobial activity of elastomers EPDM SEBS Inhibition
zone, mm 12 10 Inhibition zone, mm, 100 h at 125.degree. C. 4 2
Inhibition zone, mm, 240 h at 125.degree. C. 1 no growth under
sample
[0067] The antimicrobial properties of the blend make it very
suitable for instance for medical applications. Antimicrobial
properties of the elastomers are not lost even after extended heat
treatment.
* * * * *